Linear illumination unit



FIG. 1 is a perspective view of a linear illumination unit incorporating the design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right-side elevation view thereof;

FIG. 5 is a left-side elevation view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a back view thereof. 

CLAIM The ornamental design for a linear illumination unit, substantially as shown. 